Portable tool



NOV. 4, 1930. i 1 M, CROWE 1,780,173

PORTABLE TOOL J. M. CROWE PORTABLE TOOL Nov. 4, 1930.

Filed sept. sheets-sheet 2 Nov. 4, 1930. f J. M. cRowE 1,780,173A

PORTABLE TOOL Filed Sept. 25, 1922 l 3 Sheets-Sheet 5 Patented Nov. 4, 1930 UNITED STATES PATENT OFFICE JOHN I. CROWN, .OF COVINGTON, KENTUCKY,ASSIGNOR, BY MESNE ASSIGNMENTS, TO

THE STANLEY WORKS, OF NEW BRITAIN, CONNECTICUT, A CORPORATION OF CON-NECTICUT PORTABLE TOOL Application 1ed September 25, 1922. Serial No.590,553.'

This invention relates to improvements in a motor operated tool forsawing, cutting,

builing, grinding, etc., and more specially to a tool of this kind whichcan be conveniently supported and manipulated in the hands of theoperator.

The objects of this invention are to provide a portable tool withexchangeable discs 4for sawingfcutting, buiiing, grinding, etc., l0 suchdiscs being mounted in such a manner as to rotate in a planesubstantially parallel to the axis of the motor, thereby affordingconvenient application of the tool to the work and giving easy access tootherwise inaccessible areas; to provide convenient means for thehandling of the motor and the driven arts and for directing the samealong the pat of its operation; to provide a guard for the attachment,which guard normally covers the attachment and is easily withdrawn uponapplication of the tool to the work; to provide means for guiding thecuttin edge of the tool along the proper path; ang to provide convenientlocation for the switch'controlling the operating motor and to providealso means for Ventilating the motor in its casing.

A still further object of this invention is to provide an improveddriving connection between the driving and driven gears and also animproved means of Amounting the driven pinion upon which is detachablysecured the attachment for performing a certain class of work.

Other objects will be apparent from the following description andclaims, when considered to ether with the drawings.

Fig. 1 siows my improved device in side elevation, this form of devicecomprising the form of uard used in connection with the saw attacment,which guard is indicated in its two positions in full and dot and dashlines; Fig. 2 is a plan view of this form of device; Fig. 3 is a detailview of the guide 5 attachment; Fig. 4 is a longitudinal sectional viewtaken on line 4.-4 of Fig. 2; Fig. 5 is a longitudinal sectional viewtaken on line 5-5 of Fig. 1; Fig. 6 is an enlarged detailed view of partof Fig. 5 showing my improved means for mounting the driven gear and theattachment 'secured thereto; Fig. 7 shows in side elevatlon my improveddevice in which there lis employed a modified form of guardfor use inconnection with other attachments such as buersand the like; Fig. 8 is aplan view of the same; and Fig. 9 is a detail view of the guard.

' The electric motor 1 which is of substantially circular cross section,is snugly housed within the correspondingly formed casing 2, which hasthe screw plug closure 3 with ventilating openings 4, other Ventilatingopenings 5 being provided in the main casing wall. Screw pins 6 havethreaded engagement in the bosses 7 formed on the casing wall whiletheir inner ends 8 are of plain form to serve as dowel pins forengagement in openings in the motor wall with which the pins are adaptedto register, as clearly indicated in the drawings. The casing 2 isfurther provided with integrally formed and oppositely disposed handles9 to provide convenient means for the handling of the tool by theoperator. Socket 10 is provided in the rear end portion of one of thehandles for the electric wires 11, the switch button 12 being easilymanipulated by the finger and thumb portion of the opcrators hand.

The casing is provided also with the bearing portion 13 and the integralextending arm portion 14, which is further provided with bearing members15 and 16. The casing 2, arms 9 and arm 14 are preferably formed as asingle casting. The bearing 13 serves to support the forward end of themotor, While the shaft 17, which is driven by the motor, has its forwardend supported in the bearing 15. The beveled pinion 18, which is fixedupon the shaft 17, meshes with the bevel ear 19 for driving the same.The gear 19 is eely mounted upon the stud 2O which has its one end screwthreaded, as indicated at 21, in the bearing member 16. The gear 19rests upon the shoulder portion 22 carried by the stud 20 and the facedportion 23 of the bevel gear 19 is adapted to receive and support thedisc attachment 24 which is secured in such position by means of theleft-hand threaded member 25. The nut 25 is provided with openings 26for application and reyum moval of the same and because of the lefthandthread the accidental loosening of the disc 24 is prevented u napplication of the tool to the work. T e lock membery 27 is screwed uponthe other end of the stud 20 and is secured in such locked position bylmeans of the screw 28 which engages the by means of the screw 29. Thisguard mem ber com rises thecircular side walls 30* and 30", an thesubstantially semi-circular top portion 30 which-is cut out at thepoints 30*I and 30 to rovide openings'to permit the operator to ollowand direct the cutting operation of the tool. The one side wall 30b ofthe guard is provided with the slot 31 through which extends the screw32 secured in the arm 14, this arrangement constituting means oflimiting the swinging or pivotal movement of the guard. The coil spring33 has its-one end secured to the arm 14 as indicated at 34, and itsother end secured to the inside of the wall 30", the normal tendency ofthis spring being to force the guard to closed position so as to fullycover the saw. U on application of the free or lower edge o the saw,however, to the work, the contact of the front edge 35 with the workwill automatically turn the uard about its pivot against the tension o?the spring 33 so as to raise the same just suiciently to permit thetravel of the saw along the path of operation. Then upon removal of thetool from the work, the guard will automatically return to its closed orfully guarding posltion. As above pointed out, the disc saw 24 can beremoved and other attachments substituted therefor and secured inposition in the same manner. Such discs ma for instance, consist offlexible emery c oth which may be flexed by applying the same to thework so as to better enable the o erator to operate upon otherwiseinaccessi le areas, such as corners and the like. Buers of cloth orother suitable material, brushes of either bristles or wire, and manyother forms of attachments, such as carborundum discs and the like, maybe substituted in the same arrangement as just described, according tothe class of work which it is desired to perform. In most cases, wherethe use of the certain attachment does not necessitate the guarding ofthe hands of the oplerator against the danger of contact with t e edgeof the attachment, the form of guard shown vin Figs.

7, 8 and 9 may be substituted for that shown in the first form of devicein which the saw disc or like attachment is used. The second form ofguard device comprises a curved shield 36 extending through about 120and secured upon the arm 14 by means of screws 37 and 38 which engagethe lower portion of the side wall 39 of the guard. The wall 36 is cutaway for about half of its width, as indicated inthe drawing, so as tofacilitate the application of the same to the arm 14 so as to'occupy theposition indicated.

The graduated arm 40 may be detachably clamped to the lower edge ofeither of the side walls 30, 30b by means of the screw 41, and the guidefinger 42 is adapted to be adj usted to any desired position along thearm 40 and locked in such position by means of screw 43. The indicationson the arm 40 represent measurements from the edge of the saw or othercutting attachment, and the finger 42 upon being set at the pointcorresponding to the measurement between the edge of the work and the,contemplated cutting line, will be held against and moved along theedge of the work during the cutting operation. Thus, the saw 4forinstance is properly guided along the contemplated cutting line.

Thus, it will be seen that I have devised a portable tool which can beconveniently and easily handled by the operator and in which theoperating attachment, that is the saw disc or the like, rotates in aplane substantially parallel to the axis of the main operating shaft ofthe motor. This particular arrangement adds greatly to the facility withwhich the tool can be applied to the work and with which its operationcan be followed and directed by the operator. Other advantages flowingfrom this invention will readily suggest themselves to those who areskilled in the art to which it relates.

What I claim isz- 1. A portable tool of the class described comprisingan operating shaft, an attachment for treating the work and operated bysaid shaft in a plane substantially parallel to that of said shaft, aguard for said attachment movable to uncover the same for engagementwith the work, and means carried by said guard for guiding theattachment along the contemplated line of treatment, said tool being adated to be supported and directed manually y the operator along the pathof travel.

2. A portable hand tool of the class described, comprising an operatingshaft, an attachment operated by said shaft for treating the work, aguard for said attachment movable to uncover the same for engagementwith the work, and Ymeans carried.J by said guard and adapted forarrangement on either side of said attachment for guiding the same alongthe contemplated line of treatment.

3. In a portable power driven hand saw adapted to be applied bodily toand moved along the work by the operator, a frame, a rotary saw bladeoperatively mounted at the front thereof, a motor on said framerearwardly of and having driving connection with said blade,blade-guarding means pivoted to the frame between the blade and themotor and movable about said pivot in the plane of the blade to advanceor retreat to guard or expose a cutting portion of the blade and havinga ortion adapted to travel along the work, and automatic means eRectivein all tool` ositions and tending to advance said guar ing means.

4. In a portable power driven hand saw adapted to be applied bodily toand moved along the work by the operator, a frame, a rotary saw bladeoperatively mounted at the front thereof, a motor on said framerearwardly of and having driving connection with said blade, bladeguarding means ivoted rearwardly of the axis of the saw lade and movableabout said pivot in the plane of the blade to advance or retreat toguard or expose a cutting portion of the blade and having a portionadapted to travel along the work, and automatic means eiective in alltool positions and tending to advance said guarding means.

In testimony whereof I hereby aix my signature.

JOHN M. CROWE.

